气候变化领域集成服务门户(CCPortal): Long-Term and Seasonal Trends in Estuarine and Coastal Carbonate Systems

CCPortal

DOI	10.1002/2017GB005781
	Long-Term and Seasonal Trends in Estuarine and Coastal Carbonate Systems
	Carstensen J.; Chierici M.; Gustafsson B.G.; Gustafsson E.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	497
结束页码	513
卷号	32 期号:3
英文摘要	Coastal pH and total alkalinity are regulated by a diverse range of local processes superimposed on global trends of warming and ocean acidification, yet few studies have investigated the relative importance of different processes for coastal acidification. We describe long-term (1972–2016) and seasonal trends in the carbonate system of three Danish coastal systems demonstrating that hydrological modification, changes in nutrient inputs from land, and presence/absence of calcifiers can drastically alter carbonate chemistry. Total alkalinity was mainly governed by conservative mixing of freshwater (0.73–5.17 mmol kg−1) with outer boundary concentrations (~2–2.4 mmol kg−1), modulated seasonally and spatially (~0.1–0.2 mmol kg−1) by calcifiers. Nitrate assimilation by primary production, denitrification, and sulfate reduction increased total alkalinity by almost 0.6 mmol kg−1 in the most eutrophic system during a period without calcifiers. Trends in pH ranged from −0.0088 year−1 to 0.021 year−1, the more extreme of these mainly driven by salinity changes in a sluice-controlled lagoon. Temperature increased 0.05°C yr−1 across all three systems, which directly accounted for a pH decrease of 0.0008 year−1. Accounting for mixing, salinity, and temperature effects on dissociation and solubility constants, the resulting pH decline (0.0040 year−1) was about twice the ocean trend, emphasizing the effect of nutrient management on primary production and coastal acidification. Coastal pCO2 increased ~4 times more rapidly than ocean rates, enhancing CO2 emissions to the atmosphere. Indeed, coastal systems undergo more drastic changes than the ocean and coastal acidification trends are substantially enhanced from nutrient reductions to address coastal eutrophication. ©2018. American Geophysical Union. All Rights Reserved.
英文关键词	acidification; alkalinity; estuarine mixing; eutrophication; global warming
语种	英语
scopus关键词	acidification; alkalinity; carbonate system; coastal zone; concentration (composition); estuarine dynamics; eutrophication; freshwater input; global warming; long-term change; pH; seasonal variation; solubility; trend analysis
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129848
作者单位	Department of Bioscience, Aarhus University, Roskilde, Denmark; Institute of Marine Research, Tromsø, Norway; Baltic Nest Institute, Baltic Sea Centre, Stockholm University, Stockholm, Sweden; Tvärminne Zoological Station, University of Helsinki, Hanko, Finland
推荐引用方式 GB/T 7714	Carstensen J.,Chierici M.,Gustafsson B.G.,et al. Long-Term and Seasonal Trends in Estuarine and Coastal Carbonate Systems[J],2018,32(3).
APA	Carstensen J.,Chierici M.,Gustafsson B.G.,&Gustafsson E..(2018).Long-Term and Seasonal Trends in Estuarine and Coastal Carbonate Systems.Global Biogeochemical Cycles,32(3).
MLA	Carstensen J.,et al."Long-Term and Seasonal Trends in Estuarine and Coastal Carbonate Systems".Global Biogeochemical Cycles 32.3(2018).